CSN Bay Area

SANTA CLARA -- Frank Gore, the 49ers’ all-time leading rusher, is heading to the Indianapolis Colts.

The Colts announced Tuesday that the organization has agreed to contract terms with Gore, the No. 20 leading rusher in NFL history with 11,073 yards.

A source close to Gore said he pinpointed the Colts as a team with which he would like to sign if he did not return to the 49ers. The 49ers offered Gore a one-year contract. Gore is reportedly set to sign a three-year deal with the Colts with $8.5 million guaranteed.

[RELATED: Gore, Colts agree to terms on new deal]

Agent Drew Rosenhaus confirmed that Gore is flying to Indianapolis but a contract has not been signed. Gore reportedly agreed to terms with the Philadelphia Eagles over the weekend, but he backed out of that commitment to go to the Colts.

Meanwhile, the 49ers are turning their attention to another veteran running back. The 49ers, along with the New Orleans Saints and New England Patriots, are interested in signing free-agent Reggie Bush, according to an NFL Network report.

The Detroit Lions recently released Bush after two seasons midway through a four-year contract. Bush was bothered last season by a lingering ankle sprain that held him out of five games. He finished with just 297 rushing yards and 253 receiving yards.

49ers FA tracker:

[RELATED: 49ers free-agency tracker]

Bush has just two 1,000-yard rushing seasons in his nine-year career, which began in 2006 as the No. 2 overall pick of the New Orleans Saints.

Bush has gained 5,465 rushing yards and 3,489 yards receiving in his career. The 49ers are expected to add a running back that can possibly share the load with Carlos Hyde and Kendall Hunter.